Insulated filing cabinet construction



Oct. 14, 1952 H. c. BEHRENS 2,613,623

INSULATED FILING CABINET CONSTRUCTION Filed Sept. 4, 1948 4 Sheets-Sheet1 3e {41 M 43 as INVENTOR. HerberZ' CBe/zrms Fig.1 BY

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H C BEHRENS INSULATED FILING CABINET CONSTRUCTION III '18! Oct. 14,1952

Flled Sept 4 1948 Oct. 14, 1952 H. c. BEHRENS 2,613,623

INSULATED FILING CABINET CONSTRUCTION Filed Sept. 4, 1948 ,4 Shuts-Sheet4 G [5 ll- I N VEN TOR.

HerierzCBe/zrena F 5 7 M /Q 32 A TTO/P/VEYS Patented Oct. 14, 1952INSULATED; FILING CABINET CONSTRUCTION Herbert (3. Behrens, Canton,0hio, assignor to Diebold, Incorporated, Canton, 0hio,,a corporation of'Ohio Application September 4, 1948, Serial No. 47,838

(Cl. 109-59)n 3 Claims.

My invention relates to insulated filing cabinets of the type includinga case having lwalls forming one ormore compartments, eachcompartmenthaving an end opening, usually atthe front of the cabinet, and a drawerfor each compartment of. the case, each drawer being operatively mountedfor movement into-and out of its compartment and each drawer including aclosure front, and the ends of the compartmentforming walls around theend openings constituting jamb frames each including straight top,bottom, andside jamb frame memberseach jamb frame member including atleast one groove having a bottom wall and tongue; side walls, and eachdrawer front'being bounded by straight top, bottom, and side tonguewalls arranged for fitting in the grooves of its associated jamb frameand grooves arranged for fitting over one set of thegroove tongue wallsof the jamb frame, and-each of the compartment forming; walls of thecase and the drawer front having a composite construction includingsheet metal shell walls ,containing. a wall of heat insulating,material.

In usual prior insulated filing, cabinets,v it has been customary toform sloping sidewalls for the grooves of the jamb framemembers at theends of thewallsforming end openings for. the compartments, and it hasalso been considered to be substantially a necessity that the grooveside tongue Wall at theinside of each jamb framemembershould includeheat insulating material, in order to attain adequate protection of thecontents of the drawer in each compartment, when closed ancl locked,against'the actionof heat and moreparticularly the heat-incident to thesubjection of'theinsulated filing cabinet to direct contact with flames.

Such a jamb frame for the end opening of the drawer compartmentofaninsulated -filingcabinet including sloping side walls for-the grooveof the jamb frame and heat insulating material included in the grooveside tongue wall at the inside of each jamb frame membergives rise to acomplicated and difficult assembly ofthe walls of the jamb frame-withthe other walls ofthe compartment usually precluding spot weld assembly,and also necessitates a substantial thickness of the heat insulatingmaterial of each compartment-wall having a jamb frame member at its end,thereby requiring a substantial weight of heat insulating material inthe insulated filing cabinet.

The objects of the present invention include the provision of animproved insulated filing cabinet construction for the above describedtype of insulated filing cabinet and in which the jamb frame members foreach compartment end opening include sheet metal walls adaptedfor-spotweld assembly with sheet metal walls forming'a lining for thecompartment.

Further objects of the present invention include:

ing entirely of plies of spot weld connected sheetmetal, without anyheat insulation material in the inside tongue wall, therebyminimizingthe weight of heat insulating material in the insulated filingcabinet.

Further objects of the present invention include the provision of animproved insulated filing cabinet construction including the above described improved jamb frame for the end opening of each compartment, andwhich is adequate to provide desired protection of the contents of theclosed and locked drawer in each compartment, against specified actionof heat.

The foregoing and other objects are attained by the insulated filingcabinet construction, improvements, members, parts, combinations, andsubcombinations, which comprise the present invention, the nature ofwhich is set forth in the following general statement, and preferredembodiment of which together with their mode of use are set forth by wayof example in the following description, and which are particularly anddistinctly pointed out and-set forth inthe appended-claims forming parthereof.

The natureof the improved insulated filing cabinet construction of thepresent invention may be stated in general terms as including a casehaving walls forming one or more compartments, each compartment havingan end opening, and a drawer for each compartment, each drawer beingoperatively mounted for movement into and out of its compartment andeach drawer including a closure front,- the ends of the compartmentforming walls around=the end opening constituting a jamb frame formed bymembers each-including walls forming a groove-and the side walls of thegroove constituting outer and inner tongue walls, and the drawer frontbeing bounded by a set of tongue walls arranged for fitting in thegrooves of the jamb frame and grooves arranged for fitting over theinner set of groove side tongue walls of the jamb frame.-

Each of the compartment forming walls of the case and the drawer fronthave a composite construction including sheet metal shell wallscon-Vtaining a wall of heat insulating material. The

gasses jamb frame members around the end opening of each compartmentincludes sheet metal walls forming the jamb grooves, each with atransverse rectangular cross section, and each inner tongue wall formingthe inner side of the groove in each jamb frame member has a reverselyfolded outer border including spaced plies forming a rearwardly openingdeep groove. The compartment forming walls include sheet metal liningwalls each having a front border band which fits in the deep groovebetween the spaced plies of the reversely folded outer border of one ofthe jamb frame members, and these spaced plies have spot weldconnections with the front border bands of sheet metal compartmentlining walls fitting therebetween.

By way of example, preferred embodiments of the insulated filing cabinetconstruction of the present improvements are illustrated in theaccompanying drawings forming part hereof, in h Figure 1 is a view ofafour drawer vertical insulated filing cabinet including the presentimprovements, the composite drawer compartment forming case being shownin vertical section, the top. drawer being shown in side elevationpartially withdrawn from its compartment, the second drawer from the topbeing shown in vertical section and in its closed position in itscompartment, and the two lower drawers being shown partly in sideelevation and partly in vertical section in the closed positions intheir compartments;

' Fig. 2 is a vertical sectional view of the composite compartmentforming case of the improved insulated filing cabinet of Fig. 1, all ofthe drawers being removed from their compartments;

h Fig. 3 is an enlarged horizontal plan section as on line 3--3, Fig. 1,of the improved insulated filingcabinet, the top drawer being removedand the front end of one of the lower drawers being shown in top planview, partially withdrawn from its compartment;

Fig. 4 is a fragmentary front elevation of the improved filing cabinetlooking in the direction of the arrows 44, Fig. 1, and showing the topdrawer, with portions broken away;

Fig. 5 is an enlarged fragmentary sectional view as on line 5-5, Fig. 4,showing details of the composite drawer lock for the improved insulatedfiling cabinet;

Fig. 6 is a fragmentary vertical sectional view as on line 66, Fig. 4,showing the relative arrangement in the improved filing cabinet of thejamb members of the composite case and the top drawer when in the closedand individually locked or collectively locked position, and beforebeing subject to the action of heat or impact or both;

Fig. 7 is a view similar to Fig. 6 showing one characteristic distortionof the jamb members of the composite case and drawer front of Fig. 6after being subject to the action of heat or impact or both;

Fig. 8 is a view similar to Fig. '7 showing another characteristicdistortion of the jamb members of the composite case and drawer frontafter being subject to the action of heat or impact or both.

Similar numerals refer to similar parts throughout the drawings.

The illustrated embodiment of the insulated filing cabinet constructionof the present improvements constitutes a four drawer filing cabinet'indicated generally by l0 and includes a 4 composite case indicatedgenerally by H and having composite walls forming four end openingdrawer compartments each indicated generally by l2 and located one aboveeach other in the composite case I I. In each of the end opening drawercompartments l2 a file drawer indicated generally by |3 is mounted forhorizontal movement, as by usual drawer suspension means I including aguide channel I4 at each side of each compartment I2, the drawersuspension means being of usual construction and not otherwise describedin detail.

Each drawer I3 includes an upwardly opening drawer body indicatedgenerally by l5 on the forward end of which is secured a compositedrawer front indicated generally by I6. Each drawer body I5 is formed ofsheet metal walls and constitutes an upwardly opening longitudinallyextending rectangular box, in which are stored in a usual mannerletters, documents, and similar material, usually contained in filefolders or binders, and there may be provided in the drawer body l5 ausual compressor not shown.

Each composite drawer front 5 includes an outer sheet metal shellindicated generally by l1 in which is operatively mounted an individualdrawer lock of usual construction including as shown upper and lowerlatches |8| and |8--2 normally spring urged to extended position asshown in Fig. 1, and having an operative bolt work connection, not shownwith an individual drawer lock release lever |8-3 operatively mountedfor pivoting about a horizontal axis at the center of the compositedrawer front I6, the operating lever |83 being on the outside of thefront wall of the shell drawer pull indicated generally by I9 is securedto the front wall of each drawer shell l1, and'each drawer pull I9includes a transverse grippingbar |9-| behind which the release lever|83 is located. Each lower latch |82 of the individual drawer lock foreach drawer I3 is arrangedin a usual manner for engagement anddisengagement with a rectangular keeper opening 2|l2 formed in thebottom wall of the compartment l2 in which the drawer is mounted, andsimilarly each upper latch |8--| of each drawer I3 is arranged forengagement and disengagement in a usual manner with a rectangular keeperopening 20| formed in the top wall of the compartment |2 in which thedrawer is mounted.

As shown, and preferably, the filing cabinet I0 is provided with acollective drawer lock which includes, as best shown in Fig. 5, a lockrod 2| slidably mounted below the bottom wall 5| of the drawer body I5of the top drawer l3. The forward end of the lock rod 2| extends throughsuitable slide bearing openings formed'in the composite drawer front |6of the top drawer |3 and into a lock head slide compartment 22 formed bysheet metal walls in the composite drawer front |6 of the top drawer l3.0n the upper wall of the lock head slide compartment 22 there is mounteda lock catch 23. A transversely oval shaped lock head 24 is slidablymounted in the slide compartment 22 and the rear end of the lock head 24is secured to the forward end of the lock bar 2|. The lock head 24 hasoperatively mounted therein in a usual manner a bolt 25 extendible andretractable in a usual manner by a key into and out of the detent notch26 of the lock catch 23.

The lock rod 2| extends longitudinally beneath the bottom wall |5| ofthe body |5 of the top drawer I3 towards the drawer body rear end wallvAs shown a I--2. Intermediate the top drawerfront I 5 and its rear endwall I5-2, there is secured on the bottom wall I5I a slide and stopangle clip 21 having an apertured leg 21-I through which the lock rod 2|extends. Betweenthe clip leg 21-l and the top drawer front It there issecured on the lock rod H a washer 28, and a compression spring 29engirdles the lock rod 2| and is interposed between the washer 28 andthe angle clip leg 21-I. On the rear end of the lock rod 2I there issecured a cam nose 30 located below the top drawer rear wall l52, andthe cam nose 30 hasan upper surface 30-I sloping downwardly andrearwardly, the outer end of the cam nose 30 extending rearwardly beyondthe top drawer rear end wall I5-2.

The composite case lI includes a rectangular rear wall indicatedgenerally by I I-I, and in which is mounted a vertically extending lockbar guide tube 3I. The front wall of the guide tube 31 and frontportions of the composite case rear wall II-I have rectangular openings32 formed therein adjacent the bottom walls of the compartments 12, theopening 32 for the top compartment I2 being opposite the look rod camnose 30, and the other openings 32 being vertically aligned therewith.Within the rectangular guide tube 3| there is mounted for verticalsliding a channel lock bar 33, and there are secured on the channel lockbar 33 four latch I keeper angle clips each indicated generally by 34,and each including'a keeper leg 34-4 extending through one of theopenings 32 and havin formed therein a keeper slot 34-2.

The keeper leg 34-I for the top drawer is aligned with the cam nose 30,whose sloping upper surface 3III extends under the forward edge of thetop drawer keeper leg 34-I and elevates the same and the channel lockbar 33 and all the other keeper clips to the collective locking positionshown in Fig. 5, when the lock bar 21 is in the locked position shown inFig. 5 with the lock head 24 locked within its slide compartment 22 andthe cam nose 33 at its position closest to the case rear wall III.

On the outer face of the rear end wall I5-2 of the body I5 of eachdrawer l3, there is operatively mounted spring pressed latch meansindicated generally by 35, and including a lower latch head 35l having alower sloping bottom face 35-2 which catches in the keeper slot 34-2 ofits associated keeper clip 34 on the channel lock bar 33, when thechannel lock bar is in the locked position as shown in Fig. 5 and whenthe drawer is closed.

When the lock of the lock head 24 is unlocked, and the bolt 25 withdrawnfrom the detent notch 26, the compression spring 29 pushes the lock rod2| and cam nose 30 and lock head 24 for wardly, withdrawing the cam nose3!] from beneath the top drawer keeper leg 34-I, and permitting thechannel lock bar 33 to drop to its lowermost position at which each ofthe keeper legs 34I is below and disengaged from its associated latchhead 35I, as shown in Fig. 1.

The composite case I I includes the rectangular composite rear wallindicated generally by I ll, parallel and laterally spaced rectangularcomposite side walls indicated generally respectively by I I2 and I I-3,parallel and vertically spaced rectangular composite top and bottomwalls indicated generally respectively by I 1-4 and I l5, and threevertically spaced composite partition walls each indicated generally byII--5. As shown, the composite case II is supported on 6 four casterseach indicated generally by 33 secured to and depending from thecasebottom wall I|-5.

The several rectangular walls of the composite case II are joined witheach other atcomers and intersections, and form the four drawercompartments I2, all having the same dimensions, as shown, for mountingthe drawers I3, all having the same dimensions as shown.

Each of the composite walls of the composite case II includes outersheet metal shell walls within which is contained a thicker wall ofinsulation material, some of the composite walls being provided withmetal wire mesh reinforcement.

Each of the case composite side walls lI--2 and II-3 and the casecomposite top wall ll-4 includes an outer single ply rectangular. sheetmetal shell wall 31 and an inner single ply rectangular sheet metalshell wall 38. The sheet metal shell walls 31 and 38 are spaced fmmandparallel to each other, and a wall 39 of heat insulating material, suchas asbestos cement is located between the walls 31 and 38,, the outersurface of the insulating wall 39 being in abutment with inner faces ofthe sheet metal shell walls 31 and 38. As shown and preferably, theinsulating wall 39 embeds a metal wire mesh reinforcement 40 which isspaced from and supported by Z clips each indicated by 4| mounted on theinner faces of the sheet metal shell walls 31 and 33, and the clips onthe outer sheet metal shell walls 31 are spaced from the clips on theinner shell wall 38-so that there. isno direct metal path having anysubstantial cross sectional-area between the outer sheet metal shellwall 31 and the inner sheet metal shell wall 38.

The composite bottom wall II-5 includes an upper two ply sheet metalshell wall 42 and a lower two ply sheet metal shell Wall 43 which arespaced from each other and between which is located a wall 39 ofinsulating material embedding metal wire mesh reinforcement 40 supportedon and spaced by 2 clips 4,I depending from the top wall 42.

The case composite rear wall Ii-I includes an outer two ply sheet metalshell wall 44 and a set of inner sheet metal shell walls 45 eachspacedfrom the wall 44 and between which is located a wall 39 of insulatinmaterial embedding metal wire mesh reinforcement 40 supported on andspaced by 2 clips 4I secured on the inner faces of the walls 44 and 45.Each of the inner sheet metal shell walls 45 of the composite rear wallI ll is rectangular and'constitutes the rear end metal lining wall ofone of the compartments, I2.

Each of the composite partition walls II5 includes an upper two plysheet metal shell wall 43 and a lower single ply sheet metal shell wall41 which are vertically spaced from each other and between which islocated a sheet metal filler box indicated generally by 48 and includinga rectangular wall 48-! parallel with the parallel walls 46 and 41. Thespace between the upper sheet metal shell wall 46 and the sheet metalfiller box 48 in each composite partition wall II-B contains a wall 49of insulation material having an enlarged front end43l.

The ends of the compartment forming walls around the end opening of eachcompartment constitute an improved jamb frame .including straight top,bottom, and side jamb frame members each including walls forming arectangular groove 50, the straight sides of each groove 50 being formedby an outer tongue wall indicated generally by H or 52 and an innertongue wall indicated generally by 53. For the top compartment I2 thereis a jamb frame member having a groove 50 in the front end ofv thecomposite top-wall I'I-4, and in the front end of the composite sidewall II-2, and in the front end of the-composite side wall II-3, and inthe front end of the upper composite partition wall II-6. A set of outertongue walls include a tongue wall in the top composite wall I I-4, andin each of the side walls I I-2 and II-3, and a tongue wall 52in the topcomposite partition wall lI-Ii. A set of inner tongue walls 53 include atongue wall 53 in the top composite wall II-4 in each of the sidecomposite walls II-2 and II-3. and in the top partition wall II-Ii.

The groove side. tongue wall 52 in the front end of the. top partitionwall II-B is common to thebottomgroove 5B of the top compartment I2 andto the top groove 50 for the compartment I2..which is the second fromthe top. Similarly, in the middle partition wall II-6 there is a commongroove side tongue wall 52 at its front end which is a side wall for thebottom groove 50 for-the compartment I2 second from the top, and for thetop groove 50 of the next lower compartment I2, that is the second fromthe bottom. The bottom partition wall II-6 has a similar common grooveside tongue wall for the bottom groove 50' of the compartment I2 secondfrom the bottom and for the top groove 50 of the bottom compartment I2.

The case bottom wall II-5 has a'front end including a bottom jamb framemember having a groove 50 with an outer groove side tongue wall 5 I andan inner groove side wall 53.

All of the compartments include jamb frame side members having grooves50 formed in the front'ends of the case side walls II-2 and II-3.

All of the jamb frame members formed in the front ends of the case topwall II-4, the case side walls II-2 and II-3, and the case bottom wallII-5 have the same composite construction. Describing in detail forexample the composite jamb frame member formed in the front end of thecase side wall I I-3 and shown in the lower right hand corner of Fig. 3,this side composite jamb frame member includes a sheet metal outer shellformed as a continuation of the outer sheet metal shell wall 31 'of thecase side wall I I-3 and including a front border portion 31-I of theside wall 31, a flat parall'el edged front band portion 31-2 bentinwardly towards the case side wall -I.I-2 at right angles to the frontborder portion 31-I, a flat parallel edged groove side wall portion 31-3bent rearwardly towards the case back wall II-I at right angles to thefront band portion 31-2, a parallel edged groove bottom wall portion31-4 bent inwardly at right angles to the groove side wall portion 31-3,and a forwardly extending groove side wall portion 31-5 bent forwardlyat right angles to the groove bottom wall portion 31-4, and a rearwardlyextending parallel edged terminal border portion 31-5 reversely foldedfrom the front edge of the groove side wall 1 portion 31-5 and laterallyspaced therefrom, the groove side wall portion 31-5 and the reverselyfolded terminal border portion 31-6 thus constituting spaced pliesforming a rearwardly opening groove having a substantial depth. 1

The front border portion 38-I of the sheet metal shell wall of thecomposite case side wall II-3 extends into the groove between the innergroove side .wall 31-5 and the reversely folded terminal border portion31-6, :and 'the three plies of sheet metal 31-5, 38-I and 31-6 abut eachother and have spot weld connections with each other, and form themulti-ply sheet metal tongue wall 53 for the lamb frame member formed inthe front end of the composite case side wall II-3.

The insulating wall 39 of the composite case side wall I I-3 includes afront end portion 39-I extending into and filling the rearwardly openingchannel formed between the sheet metal shell wall border portion 31-I,front band portion 31-2, and groove side wall portion 31-3, thus forminga composite outer groove'side tongue wall 5| for the groove 50 0f thejamb frame side member in the front end of the case side wall In thefront end of each of the partition walls II-B a composite double groovedjamb frame member is formed having a construction similar to the singlegrooved jamb frame member formed in the front ends of each of the casetop, side, and bottom walls. As previously described, in the front endof each of the partition walls II-G the jamb frame member includesparallel grooves 50 with a composite central common groove side tonguewall 52 and a multi-ply sheet metal tongue Wall 53 for each groove.

As shown for example in the jamb frame member formed in the front end ofthe case side wall I I-3, in Fig. 3, the width of the groove 50 issubstantially one-half the thickness of the insulatingwall 39, thedepthof the multi-ply sheet metal tongue wall 53 is. substantially equalto the 'width of the groove 50, and the depth of the groove tongue wall5| is substantially twice the width of the groove 50.

In each composite drawer front I6 the outer sheet metal shell I1 isfilled with a wall of in-' sulating material 54, embedding metal wiremesh reinforcement 55, and each drawer front outer sheet metal shell I1includes in addition to the front wall I1-I, aback wall I1- -2, and atthe top, bottom, and each side of the shell I1, sheet metal walls form astraight jamb member having a rectangular cross section. and includingan outer composite tongue 56 at the outside of an tangular plug portionIG-I extends rearwardly from the plane of the rear faces of thecomposite tongues 56a distance which is substantially twice the depth ofthe tongues 56 from the front face of the drawer front, the plug portionIG-I being slightly smaller than the rectangular opening bounded by thejamb frame terminal border portions 31-6 into which the plug portionI1-2 extends when the drawer is closed.

By the foregoing described improved construction of the compositecompartment forming walls of the improved case II, with their compositejamb members at their front ends, the advantages and economies of spotwelding are attained in the spot weld connectionsof the three plies ofthe jamb groove sheet metal groove, side tongue walls 53, and a minimumthickness of insulating wall is attained in each of the compositecompartment forming walls, since no insulating material is included inthe inner groove tongue walls 53.

Contrary to what might be expected of the improved insulated filingcabinet Ill, when the drawers it are closed in their compartments [2 andare locked by at least the individual drawer locks, and when theimproved insulated filing cabinet is is subject to the action of heat orimpact or both, the distortions of the walls of the jamb frame membersof the case I] and of the tongue and groove forming walls of the drawerfronts it, during the usual test period for an insulated filing cabinet,are such as to block the passage of flame or hot gases into thecompartment E2 of the cabinet containing the drawer bodies 55 and theircontents.

Fig. 6 showsthe relative arrangements of the jamb frame member of thetop wall ll-4 of the insulated filing cabinet if) when the top drawer isclosed and locked and the cabinet It is not being subject to the actionof heat or impact or both. Fig. 7 is a view similar to Fig. 6 showingone type of characteristic distortions of the walls of the jamb framemember of the case top wall I 2-4 and of the interfitting tongue of thetop drawer l3, and Fig. 8 is a view similar to Fig. 7 showing anothertype of characteristic distortions of these parts after the improvedfiling cabinet it has been subject to the action of heat or impact orboth, for a specified period of time and at a specified temperature. Ineach of Figs. 7 and 8 it may be seen that despite the distortions of thejamb frame members and the interfitting parts of the drawer front [6,there are no direct passages for hot gases or flames between the jambframe and the door. In particular it should be noted that there is nosubstantial distortion of the inner groove side multiply tongue wall 53.

The embodiments of the present invention illustrated and describedherein are by way of example, and the scope of the present invention isnot limited to the same or to the particular details thereof, but iscommensurate with any and all novel subject matter contained hereinwhich may at any time properly under'the patent laws be set forth in theclaims hereof or originating herein, and the elements 'of any of suchclaims are intended to include their functional or structuralequivalents.

I claim:

1. In insulated filing cabinet construction, a case including compositewalls forming a compartment having an end opening, a drawer operativelymounted for movement into and out of the compartment and the drawerincluding a closure front, the ends of the compartment forming compositewalls around the opening including jamb frame members forming a jambframe extending around the opening, each jamb frame member includingsheet metal walls forming a groove having a bottom wall and an outergroove side tongue wall extending from one edge of the bottom wall and amulti-ply inner groove side tongue wall extending from the other edge ofthe groove bottom wall the multi-ply tongue wall including a pluralityof plies of sheet metal abutting each other and having connections witheach other, and the drawer front having bounding jamb members, eachdrawer front jamb member including an outer tongue at the outside of aninner groove, each drawer front jamb member tongue being arranged whenthe drawer is closed to fit in one of the compartment jamb frame membergrooves, and each drawer front 10 groove being arranged when the draweris closed to fit over one of the multi-ply sheet metal jamb frame innergroove side tongue walls.

2. In insulated filing cabinet construction, a case including compositewalls forming a compartment having an end opening, a drawer op-.

eratively mounted for movement into and out of the compartment and thedrawer including a closure front, the ends of the compartment formingcomposite walls around the end opening including jamb frame membersforming a jamb frame extending around the opening, each jamb framemember including sheet metal shell walls forming a groove having abottom wall portion and an outer groove side tongue walk portionextending from one edge of the bottom wall portion and an inner grooveside tongue wall portion extending from the other edge of the groovebottom wall portion and the inner groove side wall portion having arearwardly extending terminal border portion reversely folded from itsouter edge and the reversely folded terminal border portion beinglaterally spaced from the inner groove side wall portion, and eachcompartment forming composite wall including an inner sheet metalcompartment lining wall having a front border portion extending betweenits jamb frame member inner groove side wall portion and the reverselyfolded terminal border portion, and the groove inner side wall portionand the reversely folded terminal border portion and the front borderportion of the lining wall therebetween abutting each other and havingconnections with each other, and the drawer front having bounding jambmembers, each drawer front jamb member including an outer tongue at theoutside of an inner groove, each drawer front jamb member tongue beingarranged to fit when the drawer is closed in one of the compartment jambframe member grooves and each drawer front groove being arranged whenthe drawer is closed to fit over the jamb frame member inner groove sidewall portion and the reversely folded terminal border portion and thefront border portion therebetween.

3. In insulated filing cabinet construction, a case including compositewalls forming a compartment having an end opening, the ends of thecompartment forming composite walls around the opening including jambframe members forming a jamb frame extending around the opening, andeach jamb frame member including sheet metal walls forming a groovehaving a bottom wall and an outer groove side tongue wall extending fromone edge of the bottom wall and a multi-ply inner groove side tonguewall extending from the other edge of the groove bottom wall themulti-ply tongue wall including a plurality of plies of sheet metalabutting.

each other and having connections with each other.

HERBERT C. BEHRENS.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,485,360 Bartels et a1. Mar. 4,1924 1,623,155 Bellamore Apr. 5, 1927 1,678,471 Hunter July 24, 19282,270,551 Peiter Jan. 20, 1942 2,354,358 Bates July 25, 1944

